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CREATE EXTENSION jsonb_plpython2u CASCADE;
NOTICE: installing required extension "plpython2u"
-- test jsonb -> python dict
CREATE FUNCTION test1(val jsonb) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert isinstance(val, dict)
assert(val == {'a': 1, 'c': 'NULL'})
return len(val)
$$;
SELECT test1('{"a": 1, "c": "NULL"}'::jsonb);
test1
-------
2
(1 row)
-- test jsonb -> python dict
-- complex dict with dicts as value
CREATE FUNCTION test1complex(val jsonb) RETURNS int
LANGUAGE plpython2u
TRANSFORM FOR TYPE jsonb
AS $$
assert isinstance(val, dict)
assert(val == {"d": {"d": 1}})
return len(val)
$$;
SELECT test1complex('{"d": {"d": 1}}'::jsonb);
test1complex
--------------
1
(1 row)
-- test jsonb[] -> python dict
-- dict with array as value
CREATE FUNCTION test1arr(val jsonb) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert isinstance(val, dict)
assert(val == {"d": [12, 1]})
return len(val)
$$;
SELECT test1arr('{"d":[12, 1]}'::jsonb);
test1arr
----------
1
(1 row)
-- test jsonb[] -> python list
-- simple list
CREATE FUNCTION test2arr(val jsonb) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert isinstance(val, list)
assert(val == [12, 1])
return len(val)
$$;
SELECT test2arr('[12, 1]'::jsonb);
test2arr
----------
2
(1 row)
-- test jsonb[] -> python list
-- array of dicts
CREATE FUNCTION test3arr(val jsonb) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert isinstance(val, list)
assert(val == [{"a": 1,"b": 2}, {"c": 3,"d": 4}])
return len(val)
$$;
SELECT test3arr('[{"a": 1, "b": 2}, {"c": 3,"d": 4}]'::jsonb);
test3arr
----------
2
(1 row)
-- test jsonb int -> python int
CREATE FUNCTION test1int(val jsonb) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert(val == 1)
return val
$$;
SELECT test1int('1'::jsonb);
test1int
----------
1
(1 row)
-- test jsonb string -> python string
CREATE FUNCTION test1string(val jsonb) RETURNS text
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert(val == "a")
return val
$$;
SELECT test1string('"a"'::jsonb);
test1string
-------------
a
(1 row)
-- test jsonb null -> python None
CREATE FUNCTION test1null(val jsonb) RETURNS int
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
assert(val == None)
return 1
$$;
SELECT test1null('null'::jsonb);
test1null
-----------
1
(1 row)
-- test python -> jsonb
CREATE FUNCTION roundtrip(val jsonb) RETURNS jsonb
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
as $$
return val
$$;
SELECT roundtrip('null'::jsonb);
roundtrip
-----------
(1 row)
SELECT roundtrip('1'::jsonb);
roundtrip
-----------
1
(1 row)
SELECT roundtrip('1234567890.0987654321'::jsonb);
roundtrip
-----------------------
1234567890.0987654321
(1 row)
SELECT roundtrip('-1234567890.0987654321'::jsonb);
roundtrip
------------------------
-1234567890.0987654321
(1 row)
SELECT roundtrip('true'::jsonb);
roundtrip
-----------
true
(1 row)
SELECT roundtrip('"string"'::jsonb);
roundtrip
-----------
"string"
(1 row)
SELECT roundtrip('{"1": null}'::jsonb);
roundtrip
-------------
{"1": null}
(1 row)
SELECT roundtrip('{"1": 1}'::jsonb);
roundtrip
-----------
{"1": 1}
(1 row)
SELECT roundtrip('{"1": true}'::jsonb);
roundtrip
-------------
{"1": true}
(1 row)
SELECT roundtrip('{"1": "string"}'::jsonb);
roundtrip
-----------------
{"1": "string"}
(1 row)
SELECT roundtrip('[null]'::jsonb);
roundtrip
-----------
[null]
(1 row)
SELECT roundtrip('[1]'::jsonb);
roundtrip
-----------
[1]
(1 row)
SELECT roundtrip('[true]'::jsonb);
roundtrip
-----------
[true]
(1 row)
SELECT roundtrip('["string"]'::jsonb);
roundtrip
------------
["string"]
(1 row)
SELECT roundtrip('[null, 1]'::jsonb);
roundtrip
-----------
[null, 1]
(1 row)
SELECT roundtrip('[1, true]'::jsonb);
roundtrip
-----------
[1, true]
(1 row)
SELECT roundtrip('[true, "string"]'::jsonb);
roundtrip
------------------
[true, "string"]
(1 row)
SELECT roundtrip('["string", "string2"]'::jsonb);
roundtrip
-----------------------
["string", "string2"]
(1 row)
-- complex numbers -> jsonb
CREATE FUNCTION testComplexNumbers() RETURNS jsonb
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
x = 1 + 2j
return x
$$;
SELECT testComplexNumbers();
ERROR: could not convert value "(1+2j)" to jsonb
CONTEXT: while creating return value
PL/Python function "testcomplexnumbers"
-- range -> jsonb
CREATE FUNCTION testRange() RETURNS jsonb
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
x = range(3)
return x
$$;
SELECT testRange();
testrange
-----------
[0, 1, 2]
(1 row)
-- 0xff -> jsonb
CREATE FUNCTION testDecimal() RETURNS jsonb
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
x = 0xff
return x
$$;
SELECT testDecimal();
testdecimal
-------------
255
(1 row)
-- tuple -> jsonb
CREATE FUNCTION testTuple() RETURNS jsonb
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
x = (1, 'String', None)
return x
$$;
SELECT testTuple();
testtuple
---------------------
[1, "String", null]
(1 row)
-- interesting dict -> jsonb
CREATE FUNCTION test_dict1() RETURNS jsonb
LANGUAGE plpythonu
TRANSFORM FOR TYPE jsonb
AS $$
x = {"a": 1, None: 2, 33: 3}
return x
$$;
SELECT test_dict1();
test_dict1
--------------------------
{"": 2, "a": 1, "33": 3}
(1 row)
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